Authenticated code execution via unsafe pickle deserialization
Published Jun 19, 2025 · Updated Jun 23, 2025
Unsafe deserialization in Upsonic before 0.56.0 allows remote authenticated users to execute code via the add_tool endpoint. The endpoint base64-decodes the request's function field and passes the bytes directly to cloudpickle.loads, which reconstructs attacker-controlled objects. Access to the adjacent-network tools server with low privileges is required, and commands run with the Upsonic process's permissions.
Summary
What happened
Unsafe deserialization in Upsonic before 0.56.0 allows remote authenticated users to execute code via the add_tool endpoint. The endpoint base64-decodes the request's function field and passes the bytes directly to cloudpickle.loads, which reconstructs attacker-controlled objects. Access to the adjacent-network tools server with low privileges is required, and commands run with the Upsonic process's permissions.
The record
- CVE
- CVE-2025-6279
- Published
- Jun 19, 2025
- Updated
- Jun 23, 2025
- Vendor
- Upsonic
- Product
- Upsonic
- Classifications
- CWE-502, CWE-20, T1059
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 19, 2025CVE publishedPublication date reported by the CVE source.
- Jun 23, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.55.0
- Affected versionversion=0.55.1
- Affected versionversion=0.55.2
- Affected versionversion=0.55.3
- Affected versionversion=0.55.4
- Affected versionversion=0.55.5
- Affected versionversion=0.55.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Unsafe pickle deserialization proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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